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halving and doubling

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  • double 200
    100
  • half of 50
    25
  • half of 14
    07
  • double 33
    66
  • half of 35
    17.5
  • half 75
    37.5
  • half of 15
    7.5
  • double 55
    27.5
  • double 115
    230
  • half of 18.6
    9.3
  • double 300
    600
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